THE renewed fighting in Myanmar’s Rakhine State may offer the first serious test of whether Japan’s emerging strategic posture extends beyond diplomacy and development into the hard-security arena. A few years ago, I wrote in these pages about Japan’s emergence as a potential ‘new big brother’ to the US in South and Southeast Asia (May 28, 2023), arguing that Japan was no longer merely an economic giant but was increasingly positioning itself as a strategic actor connecting the interests of the US, India, and countries across the Indo-Pacific. Bangladesh appeared particularly important to this transformation, its geography making it a natural connector between the Indian Ocean, Northeast India and Southeast Asia, while Japan’s expanding engagement with India, Bangladesh and Myanmar suggested Tokyo’s interests were becoming increasingly geopolitical.

Today, the question is no longer whether Japan is becoming more strategic. Still, how far that transformation has gone and the renewed fighting in Rakhine, or Arakan State may provide a useful, if hypothetical, case study. Reports since early September indicate a significant escalation between Myanmar’s military and the Arakan Army, including artillery, drones and airpower around Sittwe, with local reporting also describing civilian displacement as fighting intensifies.

It would be premature and unfair to the available facts to describe this as a Japanese-backed operation. No publicly available evidence indicates that Tokyo played any role in directing, coordinating, or supporting the Myanmar military’s operations against the Arakan Army, and nothing in the analysis that follows should be taken to suggest otherwise. This piece does not allege Japanese involvement in this specific offensive but asks a broader, more speculative question about how Japan’s evolving strategic outlook may be reshaping how Tokyo interprets, rather than acts on, developments in Arakan.

But the absence of direct involvement is not the same as the absence of relevance, and that is where the more consequential question lies: whether Japan’s rapidly evolving strategic calculations have quietly altered the lens through which Tokyo views developments in Arakan, even without any active Japanese hand in them. A country can refrain from supporting an operation and still find that the operation’s outcome serves, or at least does not disturb, its own emerging interests. That distinction between backing an outcome and merely being comfortable with it is subtle. Still, much contemporary strategic behaviour lives there, and it deserves more scrutiny than a simple yes-or-no question about direct involvement would allow.

Japan’s foreign policy has undergone a significant transformation. Its 2026 defence white paper describes the international environment as entering a ‘new era of crisis’. It names China as its greatest strategic challenge, while Japan has continued the post-2022 expansion of defence expenditure, long-range capabilities and security partnerships, so the shift is no longer rhetorical. Japan is increasingly thinking in terms of strategic theatres, deterrence, and managing geopolitical competition, and this changes how its engagement with South and Southeast Asia might reasonably be read.

Arakan as a strategic theatre

RAKHINE is not simply another conflict zone in Myanmar. It sits at the intersection of the Bay of Bengal, Bangladesh, Northeast India and the wider Indo-Pacific, containing ports and connectivity routes linking the Indian Ocean to mainland Southeast Asia. For Dhaka, the Arakan conflict is a humanitarian, border-security, and geopolitical problem; for India, it connects to the security of its northeastern states; for China, it matters because of infrastructure and access to the Bay of Bengal around Kyaukphyu. For Japan, Rakhine sits within a larger strategic geography extending from the Indian Ocean through Bangladesh and Northeast India into mainland Southeast Asia.

This is where the argument becomes interesting. If Japan’s strategic transformation is genuinely moving beyond economic diplomacy, it becomes harder to imagine Tokyo remaining indifferent to a theatre of this significance. The issue is not necessarily whether Japan wants the Myanmar military to defeat the Arakan Army, but whether Tokyo increasingly believes the strategic balance in Rakhine matters to its wider interests — on its own, a substantial conceptual change.

The Sasakawa question

YOHEI Sasakawa’s recent visit to Bangladesh is therefore particularly interesting, coming as fighting in Rakhine intensified. Publicly, the discussions centred on the Rohingya crisis, repatriation, and humanitarian assistance, and Sasakawa also said Myanmar’s authorities are sincere about resolving the issue. Nothing is inherently unusual about Japan’s special envoy discussing repatriation with Dhaka. Still, timing matters in this kind of analysis: when diplomatic engagement coincides with a significant military development next door, the sequence deserves examination, even without evidence of coordination.

One possibility is entirely benign: Japan is attempting to revive the stalled Rohingya repatriation process and believes Bangladesh remains indispensable to that effort. A second, more strategic possibility is that Tokyo would prefer Bangladesh to remain calm and cooperative while the situation in Rakhine evolves. A third, more consequential hypothesis worth entertaining, though unproven, is that Japan has an interest in Bangladesh refraining from actions that could complicate Myanmar’s military calculations there, one that deserves monitoring rather than dismissal, since a refugee surge, cross-border incidents, or direct Bangladeshi involvement would complicate a Myanmar offensive considerably. Read this way, Bangladesh’s strategic value to Japan could be changing, from a mere development partner to something closer to a geographical stabiliser.

From development partner to strategic partner

THIS is where my earlier argument about Japan’s role in the region needs updating. Japan built its traditional influence through roads, bridges, ports and development assistance. Its emerging influence is increasingly multidimensional, encompassing defence cooperation, maritime security, intelligence sharing and geopolitical coordination — and its expanding security relationship with India is telling, with recent agreements on maritime security and information cooperation suggesting a relationship moving beyond economics.

The implications for Bangladesh are considerable. It sits between India’s Northeast and the Bay of Bengal. It provides geographical access to Myanmar and Southeast Asia, making it valuable to any power seeking a resilient regional architecture without relying exclusively on China. This does not mean Bangladesh should join an anti-China bloc; quite the opposite — its greatest strategic value may lie in maintaining relationships with China, Japan, India and the US simultaneously. But Japan’s transformation means Dhaka can no longer treat Japanese engagement as purely developmental.

The Arakan test

THE Arakan crisis therefore provides a useful test. If Japan’s involvement remains limited to humanitarian diplomacy and repatriation, the traditional interpretation of Tokyo’s role remains intact. If, however, Japan were to begin coordinating, even informally, with Bangladesh and India around border stability, maritime surveillance, infrastructure protection or refugee containment, something more significant would be underway — and should it also engage more directly with the Myanmar military on Rakhine’s security architecture while counselling Bangladesh toward restraint, the regional equation would grow considerably more interesting still.

None of this would necessarily mean Japan supports the junta: Tokyo could plausibly oppose atrocities, favour humanitarian access, and still conclude the regional consequences of an unchecked Arakan Army are strategically unacceptable to its interests — precisely why simplistic interpretations are dangerous here. The relevant question is not ‘Japan versus the Arakan Army’, but whether Japan is developing strategic preferences about who controls what, where, and under what conditions in the Bay of Bengal’s security environment — a qualitatively different Japan than the one this region has grown used to.

What should Bangladesh watch?

DHAKA should therefore watch Japanese behaviour rather than rhetoric, and three indicators matter most: whether Japan’s engagement with Myanmar expands from repatriation into security, border management or maritime affairs; whether its coordination with India increasingly treats Bangladesh, Northeast India and Myanmar as one strategic space; and whether Japanese diplomacy begins emphasising ‘stability’ and ‘order’ in Rakhine over the legitimacy of those controlling territory there. These indicators would offer stronger evidence of a strategic shift than speculation about secret involvement.

Bangladesh should pay attention for another reason: the same geography that makes it attractive to Japan also makes it vulnerable to Japanese strategic competition with China, Indian ambitions and Myanmar’s internal conflict. The Chittagong Hill Tracts should not be viewed in isolation from developments across the border, nor Rakhine independently from Northeast India, the Bay of Bengal or Bangladesh’s connectivity infrastructure — these are increasingly parts of one strategic ecosystem.

A new Japan and a new Bangladesh calculus

THE central argument of my earlier article was that Japan was becoming a new strategic pivot for the US in South and Southeast Asia. Today, the evidence suggests Japan itself is becoming more autonomous, capable, and willing to define its own strategic interests. However, that does not make it a new military hegemon, nor does it mean every regional development is the product of Japanese strategy. It does mean that countries such as Bangladesh need to reconsider the assumptions underlying their relationship with Tokyo.

The fighting in Arakan may ultimately have nothing to do with Japan, and that possibility must remain open. Yet if the offensive is accompanied by a sustained rise in Japanese diplomatic, security and strategic engagement around Bangladesh, Myanmar, Northeast India and the Bay of Bengal, it could become the first visible case study of something larger: Japan moving from provider of regional stability to manager of regional strategic outcomes.

That is the real question Bangladesh should be asking, not whether Japan has become more powerful, but whether it has become more willing to use that power. If the answer is yes, Bangladesh will have to decide how to engage the new Japan without becoming an instrument of someone else’s strategic competition. The ‘new big brother’ I wrote about a few years ago may no longer be standing behind the room. It may be entering it.

Simon Mohsin is a political and international affairs analyst.